prepare options

http.go

@@ -6,7 +6,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net"
 	"net/http"
 	"net/url"
@@ -199,7 +199,7 @@ func newRequest(ctx context.Context, log logger.Logger, addr string, req client.
 
 	var hreq *http.Request
 	if len(b) > 0 {
-		hreq, err = http.NewRequestWithContext(ctx, method, u.String(), ioutil.NopCloser(bytes.NewBuffer(b)))
+		hreq, err = http.NewRequestWithContext(ctx, method, u.String(), io.NopCloser(bytes.NewBuffer(b)))
 		hreq.ContentLength = int64(len(b))
 		header.Set("Content-Length", fmt.Sprintf("%d", hreq.ContentLength))
 	} else {